We can't alert all the time, which scam we know after something impairment. I saw some ICO which offered to hunters, to receive reward have to pay!!
it's hard to know which coins are really good or not, because it's almost the same.
be careful so that you can be more careful when doing or choosing it.
smart people are good at doing anything to cheat so they can make money quickly.
You must understand the various things about the project to be chosen so that you can find out the bad.
There is more than 2000 altcoin in market and hard to identify the project or the team behind. I think the best thing we can do is only invest in project with good liquidity in market. Mostly in top 100 coinmarketcap because its already listed in reputable exchangers and have big daily volume